Real time strategies
Full Spectrum Warrior is excellent realtime tactical game based on training software for the US Army. This is a very realistic game, that presents the modern warfare in complex urban environments.
In the game you are an American military squad leader. The squad assigned to you is divided into two fire teams: Alpha and Bravo. You will lead them in to a series of military conflicts around the world.
The danger is everywhere. In every bush, behind every window. It's not important how many enemies you will kill, important is your people to return safely home.
The US Army used the game to build a team strategic thinking among its staff. And this is not surprising. The graphics and sound are outstanding, and the overall feel of the game is exceptional. It is worth to try.
Official site:
http://en.wikipedia.org/wiki/Full_Spectrum_Warrior
Gameplay video: